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I have tried Plexus with little effect on any real scratches or blemishes in the plastic lenses of our headlights. It does a great job of surface cleaning, but won't fix any scratches.
I had a few light to medium scratches that slightly dulled the lights. I used Menzerna polishes and a PC with 4" pads and got great results. I used Power Gloss with a yellow pad, then SIP with an orange pad, and finished it up with PO106FF on a white pad. Scratches are almost imperceptible now and the lenses glisten like new.